Warning to moms: Amber Rose's pregnancy may cause jealousy! The 29-year-old model, who is expecting her first child, a baby boy, with her fiancé, Wiz Khalifa, has been bragging on Twitter about her stretch mark-free body.

Rose shared a photo of herself posing in only a bra and underwear to show off her baby bump. "Nine months pregnant and no stretch marks on my body," she captioned the shot on Sunday. "Thank you Jesus!"

The first-time mom-to-be plans on having a natural delivery -- and she can't wait for the big day! "Today was the first day of my home birthing classes," she tweeted Jan. 13. "No meds, no hospital, just the privacy of my own home. I'm so excited for this experience!"

During an interview Jan. 29 with L.A.'s Power 106, Rose and Khalifa said they have a "total boss name" picked out for their son. "It's funny because I came up with the name for our boy and immediately he came up with a rapper [nickname] for him," Rose teased. But the couple plans to wait for their son's arrival before sharing his name with the world.